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Like a balloon and as blue as the cabochon safely nestled in its side, the Ballon Bleu watch by Cartier floats through the world of Cartier watchmaking. Doubly convex, its shape strikes the perfect balance between line and volume. To avoid any ruptured lines, the domed sapphire crystal winding crown is perfectly integrated into the case, with the crown cap under a metal hoop at three o’clock protecting the blue bubble.